Production of motion-picture films.



A. F-. GALL.

PRODUCTION OF MOTION PICTURE FILMS.

. APPLICATION FILED AUG-l. I914- 1,187,137. Patented June 13, 1916.

2 SHEETS-SHEET I; Q I n W/T/VESSES: lNVENTOR d/r/ffi. 5? (4/4 W BY. a,Vivi/M H/S ATTORNEYS A. F. GA'LL. PRODUCTION OF MOTION PICTURE FILMS.

APPLICATION FILED AUG- 7. 1914- Rm m 2 6 A w v n 8 Ann hm u a .0 2 m ,fa 7 kw QQN mfiN QN WQN NQN UNITED- STATES PATENT OFFICE.

ADOLPH F. GALL, OF WEST ORANGE, NEW JERSEY, ASSIGNOR TO JERSEY PATENTCOMPANY, OF WEST. ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PRODUCTION OF MOTION-PICTURE FILMS.

Specification of Letters Patent. Patented June 13 1916,

Original application filed. October 12, 1911, Serial No. 654,224.Divided and this application filed August 7, 1914. Serial No. 855,651.

To all whom it may concern:

Be it known that I, ADOLPH F. G ALL, a citizen of the United States,residlng at West Orange, in the county of Essex, State of New Jersey,have invented certain new and useful Improvements in Production ofMotion-Picture. Films; and I do declare the following to be a full,true, and exact description of the said invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This application is a division of my application, Serial No. 654,224,filed October 12, 1911, and entitled Apparatus for ducing motion icturefihns, on which ent No. 1,109,91 temper 8, 1914.

This invention relates to a method for producing a motion picture filmwith a plurality of parallel rows of pictures thereon. The differentrows of pictureson a film of this character may represent difierentscenes or each row may represent a continuation of the scenerepresentedby one of the otherrows. When films .of this type are sufliciently long,they are made up into rolls roat was granted to me' on Sepand when thefilm is exhibited, the direction of travel of the film is reversed whenthe end of each row is reached, as the film is alternately unrolled androlled up. Thus, in a-positive film having three rows of pietures, suchas I have shown in Fig. 1 of the drawings for urposes of illustration,one outside row wi 1 be exhibited by passing the film in one direction,for instance, downward, past the lens with that row behind the lens,until the end of the row is reached; the film is then shifted sidewiseuntil the second row of pictures is behind the lens and the film is thenmoved in the opposite direction, or upward until the end of that row isreached; then the film is again moved sidewise to bring the third rowopposite the lens and the film is then moved in the original direction.This would be continued for any number of rows that the film mightcontain. Since each individual picture on such a film is projected uponthe screen in identically the same manner as all others on the fihn,without regard to the direction from which it is brought opposite thelens, all of the pictures must have the same relation to the film; thatis, the base or ground line of each of the pictures will the rowsexhibited by moving the fihn in one direction must be the reverse ofthat in the rows shown when the film is moved in the opposite direction.This will be more clearly shown by referring again to Fig. 1. Supposingthat the original scene photographed was the flight of a black arrow 1upwardly and to the left, as shown in Fig.

2, then the photographs of the left hand.

row of, Fi ,1 would represent successive positions 0 the arrow 1 as itmovedacross the field of'vision' or as it appears to move on the screenwhen projected in the regular way. In this scene, the arrow in eachpicture points toward the top or sky line of.

that picture and away from the base or ground line. For convenience ofillustration, I have represented the same scene on each of the threerows of the ositive film shown in Fig. 1, and it will e seen thatpicture 101 in row 10, and icture 111 in row 11 occupy the same relationto the film so far as the objects in the picture itself are concerned.It will be seen, however, that picture 102 of row 10 is adjacent thebase or ground line of picture 101 of that row, whereas picture 112 ofrow 11 is adjacent the top or sky line of picture 111 of that row- Row11 cannot be obtained by a mere shifting or re ersal of row 10 as anentirety and must be made by some process which will reverse theoriginal sequence of the pictures without reversing the picturesthemselves. By original sequence I mean the order in which the picturesare originally taken in the motlon picture camera. This usuall is suchthat the first picture is adjacent t e sky line of the second icture,the second picture is adjacent" a sequence,

uence, the position of each picture in re erence to the axis of the filmbeing unchanged. Thus, if the original sequence is the one I have justdescribed, in the reverse the first picture is adjacent the ground lineof the second picture, instead of the sky line of the second picture,the second picture is adjacent the ground line of the third picture,instead of the sky line of the third picture, and so on throughout thestrip.

Ordinarily motion picture cameras are constructed to move the filmacross the lens from the top downward. This produced the usual sequencefirst described above. The handle of the cameras may be turned back wardor the camera may be so constructed as to move'the film from the bottomupward, in which case the original sequence would be the reverse of theusual sequence first described above or the same as the one I have lastdescribed.

In the drawings, Figure 1 represents a positive film made in accordancewith my foo invention and having three rows of pictures; Fig. 2represents diagrammatically the original scene photographed and thepictures of which are reproduced on the positive film of Fig. 1; Fig. 3is a view showing three negatives containing pictures of the scene ofFig. 2 and from which the positive film of Fig. 1 is produced; Fi 4represents a side elevation of a comp ete machine for carrying out myimproved method; Fig. 5, a plan view of the film bank partly of Fig. 4;ig. 6, a front view of the negative handling mechanism of the machineshown in Fig. 4; and Fig. 7, a cross section thereof on the line 7-7 ofFig. 6.

Each row of pictures on the positive film shown in Fig. 1, may andusually would represent scenes photographed at different times andwithout regard to the positions they were to occupy on the positivefilm. All of the negatives would therefore be in original sequence andthe problem presented is to devise a simple and economical method ofproducing from a series of negatives, all in original sequence, apositive like Fig. 1, with the pictures of some of its rows in originaland the remainder in reversed sequence. I have found that this may beaccomplished by the method which consists, broadly, in placin thenegatives side by side, passing light t rough one picture on each of thenegatives, to the sensitized film on which the print is to be made, thenclosing off the light, and moving all of the negatives whose picturesare to be printed in original sequence, in one direction, and moving inthe opposite direction all of the negatives whose pictures are to beprinted in reversed sequence, all of such negatives being moved thespace of one picbroken away, of the machine ture only, and then passinglight through the next picture on each of the negatives to a freshportion of the sensitiz film, continuing this cycle to the end-of thenegatives. The light may be passed through the negatives directly to thesensitized film as in contact printing, or it may be passed through alens after passing through the negatives and before striking thesensitized film, as in projection printing.

In contact printing, the negative and sensitized films, are ordinarilymoved in the same direction, in which case a positive is printed withitspictures in the same sequence as the pictures on the negatives. If apositive with pictures in a sequence the reverse of the sequence of thenegative should be required, the negative would have to be moved in onedirection and the sensitized -film in the opposite direction.

In projection printing, the negative and sensitized films are ordinarilymoved in opposite directions, which produces a positive with pictures inthe same sequence as those of the negative, the lens reversing eachpicture to produce this effect. If the negative and sensitized filmsshould be moved in the same direction, a positive in reverse quence tothe ne'gative would be produced.

I may use either the contact or the projection method in printing thefilm of Fig. 1, although I prefer the latter. By the projection method,I am able to produce pictures on the positive which are smaller orlarger in size than the corresponding pictures on the negatives, thelens in such case being adjusted to project on the sensitized surface areduced or enlarged image of the picture on the negatives.

In printing from negatives all in original sequence, the positive filmshown in Fig. 1, therefore, I prefer to use the method which consists inplacing the negatives side by side in proper relation according to thepositive to be printed, passing light through one picture of eachnegative, the light passing through a lens before striking thesensitized film; then closing off the light, moving all of the negativeswhose pictures are to be printed in original sequence in one and thesame direction, moving in the opposite direction all of the negativeswhose pictures are to be printed in reversed sequence, and moving thesensitized film in the opposite direction to that in which the negativeswhose pictures are to be printed in original sequence were moved, all ofthe negatives being moved a distance suilicient to bring the nextpicture opposite the lens, and the sensitized film being moved adistance sufficient to bring a fresh portion of its surface opposite thelens; then again passing light through the negatives and the lens, andrepeating these steps to the ends of the negatives. The positive film isthen properly developed and fixed, when it is ready to be projected. Itshould be understood, however, that while the method just described isthe one which I prefer, I may substitute contact for projectionprinting, in which case the negatives would be moved inthe samedirection as in projection printing, and the sensitized film in theopposite direction, to that in which it is moved in projection printingor vice versa.

For purposes of further illustration of my method, I will assume that itis desired to produce a positive, which when projected on a screen, willreproduce the scene shown in Fig. 2, which represents the flight of ablack arrow across thefield of vision from the ground at the righttoward the sky and to the left. For ease of illustration I have assumedthat the different rows of pictures in Fig. 1 are such that each of themwill depict this flight of the arrow when projected on the screen. Toproduce such a film as shown in Fig. .1, according to my method, itwould be necessary first to have three negatives as shown at 2, 3, and 4in Fig. 3, each exactly alike, in original sequence, and as they wouldbe taken of the scene depicted, in the ordinary camera. These threenegatives would be placed side by side, with the first picture on thetwo outside negatives and the last picture on the middle negative inalinement. These three pictures on the negatives are then exposedsimultaneously, resulting in pictures 101, 117 and 121 on the positive.'The light is then shut off, and the two outside negatives are moveddownwardly and the middle negative upwardly a distance equal to theheight of one picture, thus bringing the second pictures of the twooutside negatives and the next to the last picture of the middlenegative in alinement. The sensitized film is also moved downwardly ifthe contact method of printing is used and upwardly if the projectionmethodvis used, and the light again passed through the three pictures onthe negatives which are in alinement, and pictures 102, 116 and 122 onthe positive are the result. This method will be continued until all ofthe pictures on the negatives have been printed on the positive, whenthe film of Fig. 1 will result, after it has been properly developed andfixed. An inspection of Figs. 1 and 3 will show that the pictures of themiddle negative have had their sequence reversed in the printingof themiddle row of the positive, whereas the two outside rows of the'positiveare in the same sequence as the two outside negatives.

While I have described my process as applied to the positive filmillustrated in Fig. 1, it will, of course, be understood that I am notlimited to this specific film. By my process, any positive having two.or

more rows of film, some in original and some in reverse sequence, may beproduced,

and it is also immaterial whether the rows carried out by hand, it mayalso be done by mechanism, and I have illustrated in the drawings asimple'means for doing this. This mechanism is in general like thatshown in my co-pending application No. 654,226, filed October 12, 1911in which the details of the device have been shown more fully.

Referring now to Fig. 4, 30 is a bed plate on which is mounted a sourceof light 31, a system of condensing lenses 32, the mechanism forhandling the negative films rep resented generally by 33, the mechanismfor handling the sensitized film represented generally by 34, and at 35is shown a-telescope for focusing purposes. 36 represents a bank ofrollers to be described more in detail hereafter, these rollers beingused to support the negatives when they are made up in continuous bands,as is sometimes convenient. 38 represents a source of power to operatethe machine, connected by a belt 28 with a pulley 50 on the main drivingshaft 115 of the negative handling mechanism 33 of Fig. 4. 47 is a shaftconveying power from the shaft 115 to the mechanism- 34.

In Fig. 4, 33 represents generally a mechanism in which a plurality ofnegative films may be moved intermittently'past exposure openings, someof the films being moved in one direction and the remainder in theopposite direction, all of the films being brought to rest before theexposure openings while light is passed through them from the source oflight 31.

Referring particularly to Figs. 6 and 7 is a frame supporting thevarious parts of the mechanism. 82 represents an inter mittentlyoperated shaft having sprocket wheels 22' thereon to engage with theperforations in the negatives to be handled by the mechanism. This shaftis given its intermittent motion from the main shaft by means of thewell-known Geneva star and pin wheel, represented generally at 105. Atthe left hand end of the shaft 82 (Fig. 6) is provided a set ofbevel'g'ears 13 communieating through the shaft 51 with a secondset ofbevel gears 14, one of which is on the outer end of the shaft .82. Thisshaft 82' has attached to it a sprocket wheel 23 for handling one of thethree negatives which may be passed through the machine illustrated. Itwill be obvious that when the shaft 82 turns, shaft 82' turns insynchronism therewith. 81 and 83 represent shafts at the top and bottomof the mechanism respectively, and these shafts are continuously rotatedthrough the bevel gearing 16 connecting these shafts with the maindriving shaft 115. A gate 85 hinged at 52 is pro.- vided to bear againstthe flat portion 20 of the frame 80, and this gate and flat portion ofthe frame form a chute in which the film during exposure may be held bysprings attached to the gate 85 as shown and described in my copendingapplication, Serial No. 654,226 referred to above. The plate 20 alsocontains an exposure opening 84 for each of the negatives.

I have provided a means by which the negative films may be shiftedrelatively to each other to enable the photographs thereon to be broughtin alinement, and also so that a picture on each will lie directlybehind one of the exposure openings 84 at the time light is passedthrough the negatives. Any form of suitable adjustment may be used forthis purpose, but I prefer the form shown in Fig. 7 in which 131 is asprocket roller supported on a bar 132 which bar may be made to slidehorizontally by means of the pinion 135 controlled by the handle 103,the pinion engaging in a rack 133 on the bar 132. When the roller 131 isin proper adjustment, the bar 132 is clamped in place by the screw 104.Each of the negatives to be handled by the mechanism is supplied withone of these adjusting mechanisms, and in the machine illustrated in thedrawings, the adjustment for the middle film is above the exposureopening, and for each of the remaining films is below the exposureopening 84. i

106 represents a shutter comprising a plate having openings therein,this plate being mounted in guides on the frame; so as to be moved pastthe exposure openings 84. The plate is provided with a rack 110 andthrough the segmental gears 107, the rack bar 108 and the cam 109 whichmay be operated by suitable gearing (not shown) from shaft 115, theshutter 106 is reciprocated 'so'that the openings therein pass acrossthe exposure openings 84 once for each exposure. In the mechanismdescribed, the middle negative is led into'the machine by being passedaround the bottom guide roller 53, mounted loosely on a stud 54, andindependent' of the guide rollers 55 and 56., From thence, it passesaround the rear side of the middle sprocket 21 on the shaft 83, andaround the rear side of the middle sprocket 22 on the shaft 82. It willbe noted that there is a loop of slack film formed between the shafts 82and 83. From 82, the film passes through the chute formed behind thegate 85, over the, adjusting sprocket 131, around the sprocket 23 on theshaft 82', then around the rear of the middle sprocket 24 on shaft 81,and over the upper guide roller 12 which is identical in constructionwith the guide roller 53. The two outer negatives are led in over theupper guide rollers 10 and 11, around the front side of the sprockets 24on shaft 81, thence through the chute formed behind the gate 85, aroundthe front of the sprockets 22 on the shaft 82, around the front of thesprockets 21 on the shaft 83 and around the guide rollers 55 and 56. Aloop is formed in each of these films between the shaft 81 and the filmchute, and also between the shafts 82 and 83. Guide or nipping rollers,57, 58, 59, 60, and 61 are provided on the various sprockets to hold thefilms in contact therewith.

When the shaft 82 is given an intermittent contra-clockwise motion, theshaft 82 will be given a corresponding clockwise motion. This willresult in moving the middle film intermittently upward, and the twooutside films intermittently downward. The sprockets 24 and 21 on theshafts 81 and 83 are provided to feed the proper amount of film to betaken up by each of the intermittent motions of the sprockets on theshafts 82 and 82. While the films are being moved, the shutter 106covers the exposure openings 84, but as soon as the films have come torest, the shutter is moved so that its openings pass across the exposureopenings 84, and the light from the lamp 31 passes through the picturesheld at the exposure openings 84.

Referring now to 34 of Fig. 4, 39 re resents generally a lowerlight-tight film ox, and 40 an upper film box of similar construction.41 is a light-tight tube connecting these two film boxes, and 76 is alens which focuses the light passing through the negative at theexposure openings 84 onto the sensitized film in the tube 41. The tube41 has an exposure opening in it in line with openings 84. The mechanism34 is provided with suitable devices of the well-known type used inprinting machines to move the sensitized film intermittently step by stefrom the box 39, through the tube 41, to the box 40, so as to bring anunexposed portion opposite the exposure opening in 41 at each movement.Reference is made to my co-pending application, Serial No. 654,226 abovereferred to, for a detailed description of mechanism 34. a

As I have pointed out, it is sometimes convenient to join the endsofeach of the negatives so as to form a continuous band. This isparticularly true when the ne tives are relativcly'short as compared witthe total length of sensitized film which the boxes 39 and '40 willhold, since by this means it is possible to print the entire length ofthe nega- III tive several times on the supply of sensitized filmwithout resetting or rewinding the negatives, as would be otherwiserequired if the negatives were not formed into bands. In the methodwhich I have just described, and in which some of the negatives may bemoved in one direction, and some'of the negatives moved in the otherdirection, a film bank of peculiar structure is required. As shown inFigs. 4 and 5, the film bank which I prefer is composed of a series ofrollers 66-66 rotated in.one direction, and an alternate series ofrollers 67 -67, rotated in the op osite direction. The rollers 66 areprovi ed with two sets of sprockets 6868 to engage and drive the twooutside negativeshandled by the specific mechanism illustrated, and therollers 67 carry sprockets 69 for moving the middle negative. .The middle negative passes into the film bank at the top while the two outsidenegatives pass into the film bank at the bottom. Rollers 62 and 63 aremounted on verticall adjustable member 64, so as to provide suitabletension for the loops of film. The number of rollers in the film bank,of course,-is dependentonly on the length of film required to besupported. The rollers 6667 obtain their motion through the chain 37driven by a sprocket 70 on the shaft 81 of the negative handlingmechanism 33, and the motion between the several rollers is communicatedby gearing 71 as shown. The rollers at the bottom of the film bank areidler rollers made up in three parts, each of which rotatesindependently of the other rollers on the same spindle supporting them,similar to rollers 53, 55 find 56 supported on spindle 54 as shown inBriefly described, the operation of the particular form of apparatusherein disclosed is as follows: The main driving shaft 115 of thenegative handling mechanism 33 is driven by means of belt 28, connectingpulley 50, fastened to the main shaft 115 and the source of power 38.Shaft 82 with sprockets 22 is operated intermittently from main shaft115 by the Geneva movement 105 and shaft 82 with its sprocket 23 isoperated in synchronism with shaft 82 by means of bevel gears 13, shaft51 and bevel gears 14. Shafts 83 and 81 with their sprocket wheels 21and 24 are 'continuously rotated from the main shaft 115 by bevelgearing 16. The sprockets 21, 22, 23 and 24 serve to drive the twooutside negative films downwardly throu h mechanism 33 and the middlenegative upwardly, the pictures of all these films being intermittentlyand successively brought to rest before exposure openin 84 ashereinbefore described. Cam 109 1s so shaped and is operated from shaft115 in such a manner that during movement of the negative films betweenperiods of rest, shutter 106 is moved thereby through rack 108,

84 and allow the light from lamp 31 and con-5 densing lenses 32 to passtherethrough and the pictures of the negatives registering therewith toproject images of these pictures on the sensitized film of mechanism 34.Power is conveyed to mechanism 34 from main shaft 115 by shaft 47, thesensitized film on which positives are produced from the pictures onnegative films 2, 3, and 4 passin through mechanism 33, being movedintermittently step by step from box 39 of mechanism 34 through thelight tight tube 41 to the box 40 so as to bring an unexposed portion ofthe sensitized film opposite the ex osure opening in tube 41 at eachmovement.

he sensitized film is moved'in synchronism, by mechanism 34, with thenegative films 2, 3 and 4 in a manner fully described in my co-pendingapplication referred to above whereby the plctures of the ne atives arereproduced upon the sensitized in the desired arrangement. When thenegative films are formed in endless bands or webs, they are passed toand from the mechanism 33 over the rollers 62, 63, 65, 66 and 67 of filmbank 36, the rollers of the film bank being suitably operated as bymeans of sprocket 70 of mechanism 33 and chain 37 connecting thesprocket with the gearing 71 of the film bank. The negatives may beseparately adjusted in the mechanism 33 so as to bring the icturesthereof in alinement by indepen ent mechanisms, each com rising roller131, bar 132 provided with rac 133, pinion 135, and handle 103.

While I have illustrated and described a printing mechanism handlingonly three negatives, and particularly adapted to'han dle the negatives2, .3 and 4 shown in Fig. 3, so as to roduce the positive shown in Fig.1, it will e understood, of course, that I am not limited to thisspecific mechanism. Any number of films may be moved in one directionand any number in the opposite direction, in the mechanism shown, by soconstructing the machine as to provide a suitable number of sprocketwheels on the several shafts, bearing" in mind that shaft 82 is used toive an intermittentmotion to a series of fi s in oneYdirec tion, andshaft 82' to a series of films in the opposite direction.

7 Having now described my invention, what I claim is:

.1. The method-of printing from a plurality of separate originalnegatives having the pictures all in the same sequence, a singlepositive motion picture film which shall have a plurality of rows ofpictures thereon,

some of which shall be in original and some in reversed sequence, suchmethod consisting in first assembling the said negatives side byside andwith the first picture in the series of pictures on one negative inalinement with the last picture in the series of pictures on anyadjacent negative, moving all of the negatives the pictures of which areto be prlnted in original sequence in one and the same direction, andall of the negatives the pictures of which are to be prmted in reversedsequence in the opposite direction to bring different. pictures of eachof the negatives successively in alinement, moving a sensitized filmsimultaneously and synchronously with the said negatives and in a givendirection, and successively passing light through the different alinedpictures of the negative films simultaneously and onto successiveportions of the said sensitized film, substantially as described.

2. The method of printing from a plurality of separate originalnegatives having the pictures all in the same sequence, a singlepositive motion picture film which shall have a plurality of rows ofpictures thereon, some of which shall be in original and some inreversed sequence, such method consisting in first assembling the saidnegatives side by side and with the first picture in the series ofpictures on one negative in alinement with the last picture in theseries of pictures on any adjacent negative, successively moving all ofthe negatives the pictures of which are to be printed in originalsequence in one and the same direction, and all of the negatives thepictures of which are to be printed in reversed se uence in the oppositedirection to bring di erent pictures of each of the negativessuccessively in alinement, successively moving a sensi tized filmsimultaneously and synchronously with the said negatives and in a givendirection, and successively passing light through the different alinedpictures of the negative films simultaneously and onto successiveportions of the said sensitized film,

' substantially as described.

3. The method of printing from a plurality of separate originalnegatives having the. pictures all in the same sequence, a sin-.

gle positive motion picture film which shall have a plurality of rows'ofpictures thereon, some 0 in reversed se uence, such method consisting infirst assem ling the said negatives side which shall be in original andsome by side and with the first picture in the series of pictures on onenegative in alinement with the lastpicture in the series of pictures onany adjacent negative, moving all of the negatives the pictures of whichare to be printed in original sequence in one and the same direction,and all of the negatives the pictures of which are to be printed inreversed sequence in the op osite direction to bring difi'erent pictures0 each of the negatives successively in alinement, moving a sensitizedfilm simultaneously and synchronously with the said negative and in thesame direction as the negative films the pictures 0t 'which are to beprinted in reversed sequence, and successivel passing light through thedifferent aline pictures of the negative films simultaneously and ontosuccessive portions of the said sensitized film through a lens focusedon the sensitized film, substantially as described.

4. The method of printing from a plurality of separate originalnegatives having the pictures all in the same sequence, a singlepositive motion picture film which shall have a plurality of rows ofpictures thereon, some of which shall be in original and some inreversed sequence, such method consisting in first assembling the saidnegatives side by side and with the first picture in the series ofpictures on one negative in alinement with the last picture in theseries of pictures on any adjacent negative, successively movin tures ofwhic are to be printed in original sequence in one and the samedirection, and all of the negatives the pictures of which are to beprinted in reversed sequence in the opposite direction to bringdifi'erent pictures of each of the negatives successively in alinement,successively moving a sensitized film simultaneously and synchronouslywith the said negatives and in the same direction as the negative filmsthe pictures of which are to be printed in reversed sequence, andsuccessively passing light through the different alined pictures of thenegative films simultaneously and onto successive portions of the saidsensitized film through a lens focused on the sensitized film,substantially as described.

This specification slgned and witnessed this 24: day of July, 191 4.

' ADOLPH F. GALL. Witnesses:

WOLDEMAR HAUPT,

HENRY HASPER.

all of the negatives the pic- It is hereby certified that in LettersPatent No. 1,187,137, granted June 13, 1916, upon the applicatlonofAdolph F.'Gall, of West Orange; New Jersey, for

an improvement in Production of Motion-Picture Films, errors appear theprinted specificetion requiring correction as follows: Page 1, line 49,after the word "all insert the article the; page 4, line 109, and page6, line 70,cla-i1n 3, v

for the word negative read negatives; and that the said Letters Patentshould be read with these correetions therein that the same may conformto the record of the case in the Patent Ofllce.

Signed and sealed this 13th day of February, A. D., 1917.

R. F. WHITEHEAD,

[sEALJ Acting C'dmm'iss'ioner of Patent.

